The data runs involved in this analysis are the "good asymmetry runs" 
defined by Julie (total 124 runs in Jan.). They are present in the 
"good_for_prod" table in the g0 database. Total good beam time 
~ 71 hrs.

The procedure of the analysis of proton asymmetry map in the momentum 
and angle phase space of French detectors is the following:

1) Used g0geant (code downloaded from Lars' homepage) to throw protons 
uniformly in the p:theta:phi phase space. Created the standard g0geant 
ntuple with numb_det, ToF, p, theta, eloss, etc in it. Reproduced Jeff's G0 
proton acceptance plot.

Also ran g0geant in the ELASTIC channel to generate ToF and Eloss for 
elastic protons. Then run geant with reaction 18 to create the ToF for 
pions.

2) Retrieved the yield vs ToF results from the database (2nd pass replay). 
Tried to realign the spectra on each ring by the location of the 
simulated elastic proton ToF peak. For a few other detectors, where 
the alignment with proton seemed difficult (det 15, 16 and a 
couple of others with huge DNL around proton peak), realigned them 
with the pion peak. Carefully checked detector by detector.

Took the realigned spectra, rebinned the yield and asymmetry results 
to 1ns per bin.

Performed weighted average on all runs (sorted by IHWP states). 

Final sign flip on the IHWP states (OUT-IN) to obtain the parity violating 
asymmetry vs ToF for each detector ring.

4) Back to the acceptance ntuple, made grids in (p,theta,tof) space:
p: 4MeV/C, theta: 0.5 degree, and tof: 1ns. For each cell in p-theta 
plane, find the average ToF, then look up the averaged asymmetry value 
found in 3). Several somewhat abitrary cuts were imposed before 
adopting the measured asymmetry values:

a) proton energy loss > 0.5 elastic energy loss found in 1).
b) ToF at least 2ns away from pion peak.
c) Error on the measured asymmetry (1ns bin) is less than 10 ppm
d) At least 5 hits in the cell, the RMS of the ToF in the cell < 2ns
e) If there is an overlap between the phase space of two detectors (mostly 
the acceptance edges of the adjacent rings), just take the average between 
the two asymmetries.

5) Plot the asymmetry map.

A couple of things came across my mind at the 1st glance. 
-- The somewhat smooth evolution of asymmetry in ToF for lower 
detectors (7-14) is also seen in the phase space. This gives some 
justification linear extrapolation (cut1, cut2 trick Julie presented on 
the collab. meeting).

-- Pion asymmetry is huge at low detectors (1-4), ~ -50ppm. Is this really a 
threshold effect? Why didn't it show up in the single asymmetry Guillaume 
evaluated (since we know the single rates are most from pions)?

-- The asymmetry evolves very fast from detector 15 to 16. So Guillaume and 
Serge's concern is very relevant --- using detector 16 to estimate the bkg 
asymmetry of detector 15 is dicy.